java中如何调用Shell脚本文件

public static String createFile(){
String cmd = "echo \"hhahah\" > F:\\aaa\\azzz.txt";
File file = new File("C:\\Windows\\System32");
StringBuilder result = new StringBuilder();
try {
// 在单独的进程中执行指定的字符串命令
Process process = Runtime.getRuntime().exec(cmd);
int execResult = process.waitFor();
System.out.println("执行结果："+execResult);
BufferedReader input = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line = "";
while ((line = input.readLine()) != null) {
System.out.println(line);
result.append(line);
}
input.close();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("String结果是："+result);
return "";
}

public static void main(String[] args) {
createFile();
}

原来的程序如上，运行的时候 报错信息如下：

java.io.IOException: Cannot run program "echo": CreateProcess error=2, 系统找不到指定的文件。String结果是：at java.lang.ProcessBuilder.start(ProcessBuilder.java:1047)at java.lang.Runtime.exec(Runtime.java:617)at java.lang.Runtime.exec(Runtime.java:450)at java.lang.Runtime.exec(Runtime.java:347)at cn.huimin100.pay.center.service.support.util.Test.createFile(Test.java:22)at cn.huimin100.pay.center.service.support.util.Test.main(Test.java:42)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)Caused by: java.io.IOException: CreateProcess error=2, 系统找不到指定的文件。at java.lang.ProcessImpl.create(Native Method)at java.lang.ProcessImpl.<init>(ProcessImpl.java:385)at java.lang.ProcessImpl.start(ProcessImpl.java:136)at java.lang.ProcessBuilder.start(ProcessBuilder.java:1028)... 10 more

String cmd = "cmd /c echo \"hhahah\" > F:\\aaa\\azzz.txt";

指明 cmd /c

注明：

Runtime.exec 方法创建一个本机进程，并返回 Process 子类的一个实例，该实例可用来控制进程并获取相关信息